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Summary of Significant Accounting Policies (Tables)

3 Months Ended

Jul. 31, 2020

Schedule of Cash and Cash Equivalents

		July 31, 2020				April 30, 2020
		(in thousands)
Checking and savings accounts		$	2,002			$	1,551
Money market account			9,063				8,451
		$	11,065			$	10,002

Schedule of Cash and Cash Equivalents and Restricted Cash

Restricted cash includes the following:

		July 31, 2020				April 30, 2020
		(in thousands)
Santander Bank			928				928
		$	928			$	928

Schedule of Revenue by Major Customers by Reporting Segments

The table below shows the percentage of the Company’s revenues derived from customers whose revenues accounted for at least 10% of the Company’s consolidated revenues for at least one of the periods indicated:

		Three months ended July 31,
		2020				2019
Eni S.p.A.			17	%			14	%
Premier Oil UK Limited			16	%			47	%
EGP			67	%			0	%
U.S. Navy			0	%			26	%
Other			0	%			13	%
			100	%			100	%

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

The following table summarizes share-based compensation related to the Company’s share-based plans by expense category for the three months ended July 31, 2020 and 2019:

		Three months ended July 31,
		2020				2019
		(in thousands)
Engineering and product development		$	37			$	20
Selling, general and administrative			79				72
Total share-based compensation expense		$	116			$	92

Restricted Cash [Member]

Schedule of Cash and Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the Statement of Financial Position that sum to the total of the same such amounts shown in the Statement of Cash Flows.

		July 31, 2020				April 30, 2020
		(in thousands)
Cash and cash equivalents		$	11,065			$	10,002
Restricted cash- short term			707				707
Restricted cash- long term			221				221
		$	11,993			$	10,930

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